> [1] to show that they would have to build a model with air and meat to show the solution fails, at which point the original model would be discarded You only

> [1] to show that they would have to build a model with air and meat to show the solution fails, at which point the original model would be discarded You only have to show that it fails for square (or any non-spherical shape) cow in vacuum or for spherical cow in air.